Issue with artworkFolder setting

[eseb63]

Another issue i just discover with translated indexes and index subfolders:

serverOptions: language=fr
indexTags : composer (translated in "Compositeur")

when using indexArtwork=all, the translated folder name is recognized and the original name too : images in a composer folder, or compositeur folder are shown.

when using indexArtwork=folder, the translated folder name is not recognized : images in compositeur folder aren't shown.

I also noticed that for an index having a substitute, the image should match with the original index name, not the substitute : maybe good to precise in the documentation ?